Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test F: Air Bag Diagnostic Monitor Ground Circuit Open (DTC B1921): Description
Restraints Control Module (RCM) monitors resistance between ground connections at its mounting bracket and reference ground at RCM connector C310A, terminal No. 16. If RCM detects a difference in resistance (a resistance difference as low as 10 ohms may set light flash code), it stores DTC B1921 in memory and flashes Code 14 on AIR BAG warning light.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.